Proportional dialysis unit



FIG. 1 is a front perspective view of the proportional dialysis unit, showing our new design;

FIG. 2 is a rear perspective view of the instrument of FIG. 1;

FIG. 3 is a front elevation of the instrument of FIGS. 1 and 2; and

FIG. 4 is a side elevation of the instrument of FIGS. 1-3. 

The ornamental design for a proportional dialysis unit, as shown. 